treewide: remove the-kenny from maintainers

@the-kenny did a good job in the past and is set as maintainer in many package,
however since 2017-2018 he stopped contributing. To create less confusion
in pull requests when people try to request his feedback, I removed him as
maintainer from all packages.

pkgs/applications/radio/chirp/default.nix

@@ -20,6 +20,5 @@ python2.pkgs.buildPythonApplication rec {
     homepage = "https://chirp.danplanet.com/";
     license = licenses.gpl3;
     platforms = platforms.linux;
-    maintainers = [ maintainers.the-kenny ];
   };
 }